The answer is Pennsylvanian. I worked on this before. The Pennsylvanian era is a subperiod of the Carboniferous Period. i really hope this helps :)
Answer:
I think that is China I am not sure
C. an oceanic trench is most likely form when movement along a plate boundary forces a landmass to be pulled apart.
Costa Rica
Colombia
Chile
Answer:
Index fossils, intrustions and cross-cutting relationships.
Explanation:
The correct list of three different geologic features that help scientists determine the relative ages of rocks by their position is "index fossils, intrusions, and cross-cutting relationships".
